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12 December, 13:36

Tammy has 4 cds that she is going to give away. She lets her best friend choose 2 of the 4 cds. How many different groups of 2 cds are possible

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  1. 12 December, 14:00
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    6 different groups.

    Step-by-step explanation:

    This is the number of combinations of 2 fro m 4:

    4C2 = 4! / 2! 2!

    = 4 * 3 * 2 * 1 / (2*1*2*1

    = 24/4

    = 6 groups.
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